1221187 Ο) 玖、發明說明 【發明所屬之技術領域】 本發明關於一種旋轉角度偵測設備，尤關於一種設有 一轉盤之諸如樹脂迴轉式編碼器。本發明亦關於此種設備 中所用之轉盤。 【先前技術】 許多傳統迴轉編碼器爲光學地偵測迴轉角度資訊之光 學迴轉編碼器或是磁性地偵測迴轉角度資訊之磁性迴轉編 碼器，光學迴轉編碼器爲透射迴轉式編碼器，其中光通量 由一旋轉角度資訊記錄部透射，或是反射迴轉式編碼器， 其中光通量由一旋轉角度資訊記錄部反射。 圖π爲傳統透射迴轉式編碼器一例，在此迴轉式編碼 器中，一馬達1以軸承3 ’ 4支撐一轉軸2，金屬製的一組裝 轂5組裝在轉軸2上部且以一鎖緊螺絲6固定在轉軸2上。 做爲旋轉角度記錄部的一迴轉尺7裝在組裝轂5頂部， 迴轉尺7係以一定位環8和黏劑9固定在組裝轂5，馬達1頂 面設一透射式感測頭1 1，二者之間爲一電路板。 感測頭11有設在電路板10上的一架體12，迴轉尺7周 圍部設在架體12的一上架體部12a和一下架體部12b之間 ’其方式使得迴轉尺7周圍部不與上、下架體部12a和12b 接觸。架體1 2的上架體部1 2 a容納從上而下依序設置的一 光發射元件13和一準直儀透鏡14，而架體12的下架體部 1 2b容納從上而下依序設置的一固定尺；[5和一光接收元件 -4 - (2)1221187 1 6 〇 組裝轂5爲由機製性良好之材料製成，諸 ，以高精密機製出供轉軸2組裝的一安裝孔5 a 及供迴轉尺安裝的一支撐面5b。迴轉尺7由薄 金屬板製成，並加以蝕刻或裝上供照相製版# 〇 組裝迴轉式編碼器時，組裝轂5組在馬達 且組裝轂固定在一預定推力高度位置，並接著 6鎖緊。接者將迴轉尺7放置在組裝轂5頂面， 轉軸2上的定位環8將迴轉尺7暫時固定，接著 迴轉尺7的旋轉角度資訊記錄部7a的記錄圖案 軸2中心。之後，轉軸2和定位環8以黏劑9彼此 1 2所示，最後，將感測頭1 1放在迴轉尺7附近 得迴轉尺7外周圍插在架體12的上架體部12a 1 2b之間，且將_測頭1 1固定在相對於馬達i 〇 感測頭1 1的光發射元件1 3發出的發散光通 儀透鏡1 4而被轉換成實質上平行之光束，此光 轉尺7的旋轉角度資訊記錄部7a，接著通過固 入光接收元件1 6。感測頭1 1光學地讀取依據入 元件16的光量變化而產生的旋轉角度資訊記繫 定尺1 5枏對角位置關係變化所造成的莫爾條紋 測迴轉尺7的旋轉角度。 圖1 3爲傳統反射迴轉式編碼器，此反射迴 如黃銅或鋁 之內表面以 玻璃板或薄 3 — PET 膜 1轉軸2上， 以定位螺絲 再以組裝在 進行調整使 中心對齊轉 固定，如圖 ，其方式使 和下架體部 的適當位置 量穿過準直 通量通過迴 定尺15而進 射在光接收 &部7a與固 變化，以偵 轉式編碼器 -5- (3) 沒有上述感測頭1 1，但有設置在迴轉尺7下方的感測頭！ 7 來偵測從迴轉尺7的旋轉角度資訊記錄部7a來的反射光通 量。 從上文可知，製造傳統迴轉式編碼器涉及許多元件， 諸如一組裝轂5、一鎖緊螺絲6、一定位環8、以及黏劑9。 另外，黏劑9施加在許多部位，且需要進行調中心程序， 由是，傳統迴轉式編碼器之製造涉及許多程序，且難以降 低製造成本，另外，由於迴轉尺7係利用蝕刻或爲組裝在 上面的照相製版PET膜而形成在薄玻璃板或金屬板上， 其難以達到共軸或組裝高精密度。 近來迴轉式編碼器產業已知利用合成樹脂材料將組裝 轂5和迴轉尺7—體模製，並將呈轉盤形式的模製部分輕易 地安裝在轉軸2而降低製造成本。舉例言之，本申請案的 申請人已在例如日本專利申請公開案第6 0 · 1 4 0 1 1 9號、日 本專利申請公開案第62-3 6 17號、日本新型申請公開案第 5 - 84 8 1 8號、日本專利申請公開案第5 -3 94 1 0號和5-3 94 1 1 號揭示一種具一 V槽柵的迴轉尺，並在例如日本專利公 告弟2810521 5虎和28624 1 7藏揭不'~種具一*圓柱樞的迴轉尺 〇 圖1 4爲設有利用合成樹脂材料一體模製的迴轉式編碼 器，轉盤1 8設有旋轉角度資訊記錄部〗8 ^，轉盤1 8組裝到 一馬達1的轉軸2，與上述者類似，且轉軸2和轉盤1 8係以 黏劑19結合在一起。 在此迴轉式編碼器中，上述組裝轂5、鎖緊螺絲6、和 -6 - (4) (4)1221187 定位環8非必須，另外，易達到所需的轉軸2與轉盤1 8安裝 孔18b的組裝精度以及旋轉角度資訊記錄部18a與轉盤18 安裝孔1 8 b的共軸性。另外，最麻煩的上述調中心程序可 省略。因此，製造成本可因元件數目減少以及調中心程序 省略而大幅降低。 煞而，若轉軸2爲金屬製且轉盤18爲合成樹脂製，當 周圍溫度大幅變化，轉軸2尺寸和轉盤1 8尺寸將因本身的 熱膨脹係數改變，轉軸2和轉盤1 8的相對位置將改變，因 爲合成樹脂熱膨脹係數大於金屬或玻璃的熱膨脹係數。類 似於此，若感測頭1 1爲合成樹脂製，感測頭會因其熱膨脹 係數而偏離其適佳位置。 特別言之，轉盤1 8和感測頭1 1的維度相對於轉軸2推 力方向而改變，旋轉角度資訊記錄部1 8a和感測頭之間的 最佳間隔改變，使得感測頭輸出信號亦改變。由是，感測 頭的偵測精確度變差，換言之，轉盤1 8和感測頭1 1彼此碰 撞因而造成損壞。 爲了解決上述問題，必須將轉盤1 8在推力方向裝到感 測頭1 1的間隙儘可能地減低，其涉及製造成本之增加。 【發明內容】 本發明之目的在於解決上述問題，以提供一種以低成 本構造來高度精確地偵測旋轉角度同時應付周圍溫度變化 之旋轉角度偵測設備。本發明之目的亦在於提供這種設備 之轉盤。 -7- (5) (5)1221187 爲了達成上述目的，本發明之旋轉角度偵測設備包括 °者如~馬達、齒輪及/或滑輪之旋轉元件、由合成樹脂製 成且固定在旋轉元件的一轉盤、以及依據轉盤上的旋轉角 度資訊記錄部來偵測資訊的一感測頭，其中轉盤上的旋轉 角度資訊記錄部表面是在轉軸與轉盤相對於轉軸推力方向 的一結合點和一感測頭安裝部相對於轉軸推力方向的一結 合點之間。 本發明之用於旋轉角度偵測設備之轉盤是由合成樹脂 製成’且包括要固定在一旋轉角度偵測設備的一轉軸上的 一固定部、從固定部外周圍部沿著轉軸軸線延伸的一圓柱 部、以及從圓柱部一端部沿著轉軸軸線垂直方向延伸的一 盤本體部。 從以下本發明之實施例說明將可明瞭本發明之其他目 的及特徵。 【實施方式】 接著參照圖1 - 1 〇所示本發明實施例詳細說明本發 明。 圖1爲顯示本發明第一實施例原理之剖面圖，其爲反 射式迴轉式編碼器形式之旋轉角度偵測設備。一馬達2 1的 一轉軸22被一上軸承23和一下軸承24可旋轉地支撐，一轉 盤2 5組裝在轉軸22上部，轉盤25係利用黏劑26結合在轉軸 22上。轉盤25下表面設有一旋轉角度資訊記錄部27，其包 括一或多個在圓周方向規則排列的反射元件。馬達2 1有一 -8- (6) (6)1221187 參考安裝面A，上面組裝一感測頭2 8，二者中間隔著一電 路板2 9 〇 轉盤25利用透光性合成樹脂一體模製，轉盤25設有一 固定部2Sa，其爲盤狀而固定在轉軸22上，一圓柱部25 b 沿著轉軸2 2軸向（亦即推力方向）從固定部2 5 a外周圍向 下延伸，且一盤本體部2 5 c沿著轉軸2 2垂直方向（亦即徑 向）從圓柱部2 5 b下部延伸。固定部2 5 a內部形成一安裝 孔25d供轉軸22組裝，旋轉角度資訊記錄部27則設在盤本 體部2 5 c下表面。 請注意圖中標號B爲感測頭2 8的聚光點，標號C爲 轉軸2 2和上軸承2 3內環在馬達2 1參考安裝面A上的組裝 點’標號D爲轉軸2 2和轉盤2 5的組裝點，標號E爲反射 元件在旋轉角度資訊記錄部2 7中的元件點，標號L爲組裝 點C和組裝點D在轉軸22推力方向的距離，標號η爲參 考安裝面Α和聚光點Β在轉軸22推力方向的距離，而標 號S爲組裝點D和元件點e在轉軸22推力方向的距離。 如圖2所示，感測頭2 8包括諸如發出光通量的發光二 極體（LED )的一光發射元件3 1、將光發射元件3丨來的光 通量聚光在聚光點B的一第一準直儀透鏡32、將被旋轉角 度資訊記錄部27反射的發散光通量凝縮的一第二準直儀透 鏡3 3、以及偵測從第二準直儀透鏡3 3來的光通量的一光接 收元件3 4。 在此迴轉式編碼器中，從光發射元件3 1發散地發出的 光通量被第一準直儀透鏡傳輸而轉換成收斂光通量並聚光 -9- (7)1221187 在聚光點B，在聚光點B聚光的光通量被旋轉角度資訊記 錄部27位於聚光點B的元件點E反射，因而變成發散光 通量。之後發散光通量被第二準直儀透鏡傳輸而再度轉換 成收斂光通量並入射到光接收元件3 4。上述程序中，入射 到旋轉角度資訊記錄部2 7元件點E區域以外的光通量被轉 盤傳輸。當轉盤2 5轉動，旋轉角度資訊記錄部2 7的反射元 件在圓周方向移位，光接收元件34輸出的電子信號改變， 因而得到旋轉角度資訊。 當聚光點B和元件點E彼此重合，感測頭輸出良好 電子信號，然而，因馬達21產生的熱造成周圍度上升時將 造成轉軸22、轉盤25、以及感測頭28熱膨脹，這會改變聚 光點B和元件點E的位置，有鑒於此，第一實施例設計 成滿足下列式（1 )和式（2)，俾防止聚光點B和元件點e的 位置變化= (1) (2)1221187 〇). Description of the invention [Technical field to which the invention belongs] The present invention relates to a rotation angle detection device, and more particularly to a rotary encoder such as a resin provided with a turntable. The invention also relates to a turntable used in such equipment. [Prior technology] Many traditional rotary encoders are optical rotary encoders that detect the rotation angle information optically or magnetic rotary encoders that detect the rotation angle information magnetically. The optical rotary encoders are transmission rotary encoders, in which the light flux is It is transmitted by a rotation angle information recording unit or is a reflective rotary encoder, wherein the light flux is reflected by a rotation angle information recording unit. Figure π is an example of a traditional transmission rotary encoder. In this rotary encoder, a motor 1 supports a rotating shaft 2 with bearings 3 ′ 4 and a metal assembly hub 5 is assembled on the upper part of the rotating shaft 2 with a locking screw. 6 is fixed on the rotating shaft 2. A rotary ruler 7 as a rotation angle recording part is mounted on the top of the assembly hub 5. The rotary ruler 7 is fixed to the assembly hub 5 with a positioning ring 8 and an adhesive 9. A transmissive sensor head 1 is provided on the top surface of the motor 1. , Between the two is a circuit board. The sensor head 11 has a frame 12 provided on the circuit board 10, and the peripheral portion of the rotary ruler 7 is provided between an upper frame portion 12a and a lower frame portion 12b of the frame 12. No contact with the upper and lower frame bodies 12a and 12b. The upper frame body portion 12a of the frame body 12 accommodates a light emitting element 13 and a collimator lens 14 arranged in order from top to bottom, and the lower frame body portion 12b of the frame body 12 receives the top-down structure. A fixed ruler provided in sequence; [5 and a light receiving element-4-(2) 1221187 1 6 〇 The assembly hub 5 is made of a material with good mechanical properties, and a high-precision mechanism is used to assemble the rotating shaft 2 The mounting hole 5 a and a supporting surface 5 b for mounting the rotary ruler. The rotary ruler 7 is made of a thin metal plate, and is etched or mounted for photo-making. # 〇 When assembling a rotary encoder, 5 sets of assembly hubs are mounted on the motor and the assembly hub is fixed at a predetermined thrust height position, and then 6 is locked. . Then, the rotary ruler 7 is placed on the top surface of the assembly hub 5, the positioning ring 8 on the rotary shaft 2 temporarily fixes the rotary ruler 7, and then the center of the pattern 2 is recorded on the rotary angle information recording section 7a of the rotary ruler 7. After that, the rotating shaft 2 and the positioning ring 8 are shown with each other 12 by the adhesive 9. Finally, the sensor head 11 is placed near the rotary ruler 7 so that the outer periphery of the rotary ruler 7 is inserted into the upper frame portion 12a 1 2b of the frame 12 And the _ probe head 1 1 is fixed to a divergent light flux lens 14 emitted by the light emitting element 13 of the motor i 〇 sensor head 1 1 and converted into a substantially parallel light beam. The rotation angle information recording section 7a of the ruler 7 is then fixed to the light-receiving element 16. The sensor head 1 1 optically reads a rotation angle information record generated according to a change in the amount of light entering the element 16. A fixed scale 15 5 的 Moire fringes caused by a change in a diagonal position relationship. The rotation angle of the rotary ruler 7 is measured. Figure 13 is a traditional reflective rotary encoder. This reflection is reflected on a glass plate or a thin 3 — PET film 1 on the inner surface of brass or aluminum. The positioning screws are then assembled to adjust the center alignment and rotation. As shown in the figure, the proper position of the lower body and the lower frame pass through the collimating flux and return to the fixed scale 15 to enter the light receiving & part 7a and change to a fixed encoder-5- ( 3) There is no sensor head 1 1 mentioned above, but there is a sensor head located below the rotary ruler 7! 7 to detect the reflected light flux from the rotation angle information recording section 7a of the rotary ruler 7. As can be seen from the above, manufacturing a conventional rotary encoder involves many components, such as an assembly hub 5, a locking screw 6, a positioning ring 8, and an adhesive 9. In addition, the adhesive 9 is applied to many parts and requires a centering process. Therefore, the manufacturing of the traditional rotary encoder involves many processes and it is difficult to reduce the manufacturing cost. In addition, the rotary ruler 7 is etched or assembled for assembly. The above photographic plate-making PET film is formed on a thin glass plate or a metal plate, and it is difficult to achieve high precision of coaxial or assembly. Recently, the rotary encoder industry has known that the assembly hub 5 and the rotary ruler 7 are body-molded using a synthetic resin material, and the molded part in the form of a turntable is easily installed on the shaft 2 to reduce the manufacturing cost. For example, the applicant of this application has been in, for example, Japanese Patent Application Laid-open No. 60 · 14 0 1 19, Japanese Patent Application Laid-open No. 62-3 6 17 and Japanese New Application Laid-open No. 5 -84 8 1 8 and Japanese Patent Application Laid-Open Nos. 5 -3 94 1 0 and 5-3 94 1 1 disclose a rotary ruler with a V-groove grid, and are disclosed in, for example, Japanese Patent Publication No. 2810521 5 28624 1 7 Zang Jiebu '~ a rotary ruler with a * cylindrical pivot. Figure 14 is a rotary encoder with integrated molding made of synthetic resin material, and the turntable 18 is equipped with a rotation angle information recording section. 〖8 ^ The turntable 18 is assembled to the rotation shaft 2 of a motor 1, similar to the above, and the rotation shaft 2 and the turntable 18 are combined with the adhesive 19 together. In this rotary encoder, the above-mentioned assembly hub 5, lock screw 6, and -6-(4) (4) 1221187 positioning ring 8 are not necessary, and it is easy to reach the required rotation shaft 2 and turntable 18 mounting holes. The assembly accuracy of 18b and the coaxiality of the rotation angle information recording unit 18a and the turntable 18 mounting hole 18b. In addition, the most troublesome adjustment procedure mentioned above can be omitted. As a result, manufacturing costs can be drastically reduced by reducing the number of components and omitting the centering process. Suddenly, if the rotating shaft 2 is made of metal and the rotating disk 18 is made of synthetic resin, when the ambient temperature changes greatly, the size of the rotating shaft 2 and the size of the rotating disk 18 will change due to its own thermal expansion coefficient, and the relative position of the rotating shaft 2 and the rotating disk 18 will change. Because the thermal expansion coefficient of synthetic resin is greater than that of metal or glass. Similarly, if the sensor head 11 is made of synthetic resin, the sensor head may deviate from its proper position due to its thermal expansion coefficient. In particular, the dimensions of the turntable 18 and the sensor head 1 1 change with respect to the thrust direction of the rotation shaft 2, and the optimal interval between the rotation angle information recording section 18 a and the sensor head changes, so that the output signal of the sensor head also changes. change. As a result, the detection accuracy of the sensor head deteriorates, in other words, the turntable 18 and the sensor head 1 1 collide with each other and cause damage. In order to solve the above-mentioned problems, it is necessary to reduce the gap of the turntable 18 to the sensor head 1 1 in the thrust direction as much as possible, which involves an increase in manufacturing costs. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, so as to provide a rotation angle detection device that can detect a rotation angle with a low cost structure and highly accurately cope with a change in ambient temperature. It is also an object of the present invention to provide a turntable for such equipment. -7- (5) (5) 1221187 In order to achieve the above purpose, the rotation angle detection device of the present invention includes a rotating element such as a motor, gear, and / or pulley, a synthetic resin and fixed to the rotating element. A turntable and a sensor head for detecting information according to the rotation angle information recording part on the turntable, wherein the surface of the rotation angle information recording part on the turntable is a combination point and a sense of the rotation axis and the thrust direction of the turntable relative to the rotation axis. Between a coupling point of the probe mounting portion with respect to the thrust direction of the rotating shaft. The turntable for a rotation angle detection device of the present invention is made of synthetic resin and includes a fixing portion to be fixed on a rotation shaft of a rotation angle detection device, and extends from the outer peripheral portion of the fixing portion along the rotation axis line. A cylindrical portion and a disc body portion extending from one end of the cylindrical portion in a direction perpendicular to the axis of the rotation axis. Other objects and features of the invention will become apparent from the following description of embodiments of the invention. [Embodiment] Next, the present invention will be described in detail with reference to the embodiment of the present invention shown in Figs. Fig. 1 is a sectional view showing the principle of the first embodiment of the present invention, which is a rotation angle detecting device in the form of a reflective rotary encoder. A rotating shaft 22 of a motor 21 is rotatably supported by an upper bearing 23 and a lower bearing 24. A rotating disk 25 is assembled on the upper portion of the rotating shaft 22, and the rotating disk 25 is bonded to the rotating shaft 22 with an adhesive 26. A rotary angle information recording section 27 is provided on the lower surface of the turntable 25, and includes one or more reflective elements regularly arranged in the circumferential direction. The motor 2 1 has a -8- (6) (6) 1221187 with reference to the mounting surface A, and a sensor head 2 8 is assembled thereon, with a circuit board 2 9 between them. The turntable 25 is integrally molded with a light-transmitting synthetic resin. The turntable 25 is provided with a fixing portion 2Sa, which is disk-shaped and fixed on the rotation shaft 22, and a cylindrical portion 25b extends downward from the outer periphery of the fixing portion 25a along the rotation shaft 22 axis (that is, the thrust direction). And a disk body portion 2 5 c extends from the lower portion of the cylindrical portion 2 5 b along the vertical direction (ie, radial direction) of the rotation axis 22. A fixing hole 25d is formed inside the fixing portion 25a for assembling the rotating shaft 22, and a rotation angle information recording portion 27 is provided on the lower surface of the disk body portion 2c. Please note that the reference numeral B in the figure is the focusing point of the sensor head 28, the reference numeral C is the assembly point of the inner shaft 2 2 and the upper bearing 2 3 on the motor 2 1 reference mounting surface A, and the reference numeral D is the rotary shaft 2 2 and The assembly point of the turntable 25, the reference E is the component point of the reflective element in the rotation angle information recording section 27, the reference L is the distance between the assembly point C and the assembly point D in the thrust direction of the rotation shaft 22, and the reference η is the reference mounting surface A The distance from the focusing point B in the thrust direction of the rotation shaft 22, and the reference sign S is the distance between the assembly point D and the component point e in the thrust direction of the rotation shaft 22. As shown in FIG. 2, the sensor head 28 includes a light emitting element 31 such as a light emitting diode (LED) that emits light flux, and condenses the light flux from the light emitting element 3 at the first spot of the light collecting point B. A collimator lens 32, a second collimator lens 3 that condenses the divergent light flux reflected by the rotation angle information recording section 27, and a light reception that detects the light flux from the second collimator lens 33 Element 3 4. In this rotary encoder, the luminous flux emitted divergently from the light emitting element 31 is transmitted by the first collimator lens to be converted into a convergent luminous flux and condensed. 9- (7) 1221187 The light flux condensed by the light spot B is reflected by the element angle E of the rotation angle information recording unit 27 located at the light condensing point B, and thus becomes a divergent light flux. Thereafter, the divergent light flux is transmitted by the second collimator lens, and is again converted into a convergent light flux and is incident on the light receiving element 34. In the above procedure, the luminous flux incident on the rotation angle information recording section 27 outside the element point E area is transmitted by the turntable. When the turntable 25 is rotated, the reflective element of the rotation angle information recording section 27 is shifted in the circumferential direction, and the electronic signal output from the light receiving element 34 is changed, thereby obtaining the rotation angle information. When the condensing point B and the component point E coincide with each other, the sensor head outputs a good electronic signal. However, when the surrounding degree rises due to the heat generated by the motor 21, the shaft 22, the turntable 25, and the sensor head 28 will thermally expand, which will change. In view of this, the first embodiment is designed to satisfy the following formulas (1) and (2) to prevent the positions of the focus point B and the component point e from changing: (1) (2)
β χΗχΔ Τ= ( a 2xL*f a lxS) x Δ Tβ χΗχΔ Τ = (a 2xL * f a lxS) x Δ T
L = S + H 其中α 1爲轉盤2 5熱膨脹係數’ α 2爲轉軸2 2熱膨脹係 數，/3爲感測頭在最佳位置之熱特性係數，而△ T爲溫度 變化。至於距離Η和L，在參考安裝面a上方之量爲正 (+ )値，而距離S，在組裝點D上方之量爲正（+ )値， 假定轉軸22、轉盤25、以及感測頭28溫度變化方式實質相 同0 -10- (8) (8)1221187 另外，△ Η爲距離Η之變化，其隨著溫度變化△ T而 改變，而溫度特性係數yS定義爲冷=△ Η/Η，意即溫度特 性係數々爲量化表示隨著溫度變化而改變的距離Η改變 率之係數。 圖3爲周圍溫度在20°C常溫時之狀態，聚光點Β和元 件點E彼此重合，意即轉盤25以最佳位置關係固定在轉軸 2 2上。製造迴轉式編碼器時，熱膨脹係數α 1和α 2以及溫 度特性係數Θ爲已知，另外，聚光點Β位置可在安裝感測 頭28後事先決定，意即亦可事先決定距離Η，因此距離L 和距離S可藉由將熱膨脹係數α 1和α 2、溫度特性係數/3 以及距離Η之個別値代入式（1)並同時解出式（1)和式（2)而 得以決定，得到的距離L和S之後，即可決定轉軸22、轉 盤25、以及感測頭28的形狀和固定位置。 圖4爲上述安排效果圖，其顯示出溫度特性係數々=0 且周圍溫度大幅變化之情形，另外，轉軸22由不銹鋼製成 ，且轉盤25由聚碳酸鹽製成，因此熱膨脹係數α 1幾乎等 於6·6χ10_5，而熱膨脹係數α2幾乎等於1.47χ10·5，若假定 距離Η爲7.7麵，即決定出距離L爲+ 9· 9麵，而距離S爲-2 · 2 mm 〇 此時，由於假定溫度特性係數yS =0，感測頭不受溫度 影響，因此聚光點B之位置不會改變，然而，由於周圍溫 度上升，轉軸22和轉盤25依據其熱膨脹係數α 1和α 2熱脹 。當轉軸22熱脹，組裝點D上移，因此距離L加大到距 離L5。另外，轉盤以組裝點D爲參考點在向下方向膨脹 -11 - (10) (10)1221187 第—安裝維度的第二安裝部2 5 e，以提供適當間隙供所需 黏劑量滲入。由是，可得到轉盤25與轉軸22之間的結合強 度。 圖8爲本發明第四實施例，其與圖7類似，其中將轉盤 2 5安裝到轉軸22之方式以及轉盤之形狀與第一及第二實施 例所不者不同。轉盤25係用一金屬模一體成型，以射出模 製出一旋轉資訊記錄部、具有一第一安裝維度的一第一安 裝部25d、以及具有一第二安裝維度的_第二安裝部25e， 其方式與第三實施例類似。轉盤形成方式爲轉盤的旋轉資 訊記錄部圖案中心與第一安裝部25d的共軸性得以特別高 精度地確保，使得其在高精度下安裝到轉軸22。 本實施例之轉盤爲有一底部之錐狀，且其易於在有底 的錐部提供樹脂材料柵，換言之，其能在圖案中心提供柵 ，因此樹脂流動點相對於圖案對稱，因而能提升圖案之精 度。 圖9爲顯示發明第五實施例之設備原理之剖面圖，在 此設備中，一轉盤53利用黏劑54組裝在一馬達51的一轉軸 52頂面，轉軸52頂面設有一凹槽52a供黏劑54施加。 轉盤5 3設有要放置在轉軸5 2頂面的一固定部5 3 a、從 固定部5 3 a外周圍向下延伸的一圓柱部5 3 b、以及從圓柱 部5 3 b下部水平地且向下地延伸的一盤本體部5 3 c。圓柱 部53b內部形成一安裝孔53d供轉軸52裝入，其方式使得 轉軸5 2外圓周面與安裝孔5 3 d內圓周面之間有一小間隙。 圓柱部53b下表面設有一旋轉角度資訊記錄部27，此第五 -13- (11) (11)1221187 實施例亦達成與第一至三實施例之相同效果。 圖爲顯示發明第六實施例之設備原理之剖面圖，在 此設備中，一轉盤6 3利用一墊圈6 4和一定位螺絲6 5組裝在 一馬達61的一轉軸62頂面，轉軸62頂面設有—螺孔62a供 定位螺絲6 5螺設。 轉盤63設有要放置在轉軸62頂面的—盤狀固定部63a 、從固定部6 3 a外周圍向下延伸的一圓柱部6 3 b '以及從 圓柱部63 b下部水平地且向下地延伸的一盤本體部63 ^。 圓柱部63b內部形成一安裝孔63d供轉軸62裝入，其方式 使得轉軸6 2外圓周面與安裝孔6 3 d內圓周面之間有—小間 隙。圓柱部6 3 b下表面設有一旋轉角度資訊記錄部2 7，此 第六實施例亦達成與第一至三實施例之相同效果。 如前所述，在依據本發明的旋轉角度偵測設備中，旋 轉角度資訊記錄部與感測頭之相對位置係由轉盤熱膨脹係 數、轉軸熱膨脹係數、以及感測頭的溫度特性係數決定， 得以維持旋轉角度資訊記錄部與感測頭之最佳相對位置， 即使周圍溫度有所變化。因此能穩定輸出信號而減低偵測 錯誤，同時提升轉盤與轉軸之結合強度。另外，其可擴大 可用溫度範圍並得到高解析度及高精度之旋轉角度偵測。 本發明的旋轉角度偵測設備之轉盤係由合成樹脂材料 製成，並設有要固在旋轉角度偵測設備轉軸的一固定部、 從固定部外周圍部沿著轉軸軸線延伸的一圓柱部、以及從 圓柱部一端部沿著轉軸軸線垂直方向延伸的一盤本體部。 因此，當周圍溫度上升，圓柱部主要在軸線方向膨脹，俾 -14- (12) (12)1221187 抵消轉軸在軸線方向之膨脹。 另外’在提供可在轉軸與轉盤之間建立最小間隙的一 第一安裝部俾提高其共軸性以及提供用來將轉盤黏結或固 定在轉軸的一第二安裝部之下，其可維持感測頭與轉盤之 間穩定位置關係，無懼溫度變化，同時保持高度共軸性。 【圖式簡單說明】 圖1爲周圍部分第一實施例之剖面圖。 圖2爲感測頭之圖。 圖3爲聚光點和元件點重合之情形。 圖4爲溫度上升之狀態效應圖。 圖5爲周圍部分第二實施例之剖面圖。 圖6爲溫度上升之狀態效應圖。 圖7爲周圍部分第三實施例之剖面圖。 圖8爲周圍部分第四實施例之剖面圖。 圖9爲周圍部分第五實施例之剖面圖。 圖10爲周圍部分第六實施例之；剖面圖。 圖1 1爲傳統透射式編碼器部分剖面圖。 圖12爲傳統編碼器放大平面圖。 圖1 3爲傳統反射式編碼器部分剖面圖。 圖1 4爲具有一體轉盤的傳統透射式編碼器部分剖面圖 [圖號說明] -15- (13)1221187 1 馬 達 2 轉 軸 • 3 軸 承 * 4 軸 承 5 組 裝 轂 5a 安 裝 孔 5b 支 撐 面 6 定 位 螺 絲 7 迴 轉 尺 7a 旋 轉 角 度 資 訊 記 錄 部 8 定 位 環 9 黏 劑 10 電 路 板 11 感 測 頭 12 架 體 12a 上 架 體 部 12b 下 架 體 部 13 光 發 射 元 件 14 準 直 儀 透 鏡 15 固 定 尺 16 光 接 收 元 件 17 感 測 頭 18 轉 盤 18a 旋 轉 角 度 資 訊 記 錄 部 -16 (14)1221187 18b 安裝孔 19 黏劑 2 1 馬達 22 轉軸 23 上軸承 24 下軸承 25 轉盤 25a 固定部 25b 圓柱部 25c 盤本體部 25d 安裝孔/第一安裝部 25e 第二安裝部 26 黏劑 27 旋轉角度資訊記錄部 28 反射式感測頭 29 電路板 3 1 光發射元件 32 第一準直儀透鏡 33 第二準直儀透鏡 34 光接收元件 5 1 馬達 52 轉軸 52a 凹槽 53 轉盤 -17 (15)1221187 53a 固定部 53b 圓柱部 53c 盤本體部 53d 安裝孔 54 黏齊^ 6 1 馬達 62 轉軸 62a 螺孔 63 轉盤 63a 固定部 63b 圓柱部 63c 盤本體部 63 d 安裝孔 63 e 嵌孔 64 墊圈 65 定位螺絲 A 參考安裝面 B 聚光點 C 組裝點 D 組裝點 E 元件點 H 距離 H? 距離 L 距離 -18 1221187 (16) L’ 距離 S 距離L = S + H where α 1 is the thermal expansion coefficient of the rotary disk 2 5 and α 2 is the thermal expansion coefficient of the rotary shaft 2 2, / 3 is the thermal characteristic coefficient of the sensor at the optimal position, and Δ T is the temperature change. As for the distances Η and L, the amount above the reference mounting surface a is positive (+) 値, and the distance S is above the assembly point D is positive (+) 値, assuming the rotation shaft 22, the turntable 25, and the sensor head 28 The temperature change mode is substantially the same. 0 -10- (8) (8) 1221187 In addition, △ Η is the change in distance Η, which changes with the temperature change △ T, and the temperature characteristic coefficient yS is defined as cold = △ Η / Η , That is, the temperature characteristic coefficient 々 is a coefficient that quantifies the distance Η change rate that changes with temperature change. Fig. 3 shows a state where the ambient temperature is at a normal temperature of 20 ° C, and the condensing point B and the element point E coincide with each other, which means that the turntable 25 is fixed on the rotating shaft 22 in an optimal positional relationship. When manufacturing rotary encoders, the thermal expansion coefficients α 1 and α 2 and the temperature characteristic coefficient Θ are known. In addition, the position of the focusing point B can be determined in advance after the sensor head 28 is installed, which means that the distance Η can also be determined in advance. Therefore, the distance L and the distance S can be determined by substituting the thermal expansion coefficients α 1 and α 2, the temperature characteristic coefficient / 3, and the individual Η of the distance Η into equation (1) and solving equations (1) and (2) at the same time. After obtaining the distances L and S, the shapes and fixed positions of the rotating shaft 22, the rotating disk 25, and the sensor head 28 can be determined. Fig. 4 is an effect diagram of the above arrangement, which shows a case where the temperature characteristic coefficient 々 = 0 and the surrounding temperature changes greatly. In addition, the rotating shaft 22 is made of stainless steel, and the rotating disk 25 is made of polycarbonate, so the thermal expansion coefficient α 1 is almost Is equal to 6.6x10_5, and the coefficient of thermal expansion α2 is almost equal to 1.47x10 · 5. If the distance Η is assumed to be 7.7 planes, it is determined that the distance L is + 9 · 9 planes, and the distance S is -2 · 2 mm. At this time, because Assuming the temperature characteristic coefficient yS = 0, the sensor head is not affected by temperature, so the position of the focusing point B will not change. However, due to the rise in ambient temperature, the rotary shaft 22 and the rotary disk 25 thermally expand according to their thermal expansion coefficients α 1 and α 2 . When the shaft 22 is thermally expanded, the assembly point D moves up, so the distance L increases to a distance L5. In addition, the turntable expands in the downward direction using the assembly point D as a reference point. -11-(10) (10) 1221187 The second mounting portion 2 5e in the first installation dimension to provide a proper clearance for the required amount of infiltration. Therefore, the coupling strength between the turntable 25 and the rotation shaft 22 can be obtained. Fig. 8 is a fourth embodiment of the present invention, which is similar to Fig. 7, in which the manner of mounting the turntable 25 to the shaft 22 and the shape of the turntable are different from those of the first and second embodiments. The turntable 25 is integrally formed with a metal mold to injection-mold a rotary information recording section, a first mounting section 25d having a first mounting dimension, and a second mounting section 25e having a second mounting dimension. The manner is similar to that of the third embodiment. The turntable is formed in such a manner that the coaxiality of the center of the pattern of the rotating information recording portion of the turntable and the first mounting portion 25d is ensured with particularly high precision, so that it is mounted on the rotation shaft 22 with high accuracy. The turntable of this embodiment is a cone with a bottom, and it is easy to provide a grid of resin material at the bottom of the cone. In other words, it can provide a grid at the center of the pattern, so the resin flow point is symmetrical with respect to the pattern, which can enhance the pattern. Precision. FIG. 9 is a cross-sectional view showing the principle of a device according to a fifth embodiment of the invention. In this device, a turntable 53 is assembled with an adhesive 54 on the top surface of a shaft 52 of a motor 51, and a groove 52a is provided on the top surface of the shaft 52. The adhesive 54 is applied. The turntable 5 3 is provided with a fixed portion 5 3 a to be placed on the top surface of the rotating shaft 5 2, a cylindrical portion 5 3 b extending downward from the outer periphery of the fixed portion 5 3 a, and horizontally from the lower portion of the cylindrical portion 5 3 b A plate body portion 5 3 c extending downward. A mounting hole 53d is formed inside the cylindrical portion 53b for the rotation shaft 52 to be inserted in such a manner that there is a small gap between the rotation shaft 52's outer circumferential surface and the mounting hole 53'd inner circumferential surface. A rotation angle information recording portion 27 is provided on the lower surface of the cylindrical portion 53b. This fifth embodiment also achieves the same effects as the first to third embodiments. The figure is a sectional view showing the principle of a device according to a sixth embodiment of the invention. In this device, a turntable 6 3 is assembled with a washer 6 4 and a set screw 6 5 on the top surface of a rotating shaft 62 of a motor 61 and the rotating shaft 62 The surface is provided with a screw hole 62a for setting screws 65. The turntable 63 is provided with a disc-shaped fixing portion 63a to be placed on the top surface of the rotation shaft 62, a cylindrical portion 63b 'extending downward from the outer periphery of the fixing portion 63a, and horizontally and downwardly from the lower portion of the cylindrical portion 63b. The extended body part 63 ^. A mounting hole 63d is formed inside the cylindrical portion 63b for the rotation shaft 62 to be inserted in such a manner that there is a small gap between the outer circumferential surface of the rotation shaft 62 and the inner circumferential surface of the mounting hole 63d. A rotation angle information recording portion 27 is provided on the lower surface of the cylindrical portion 6 3 b. This sixth embodiment also achieves the same effects as the first to third embodiments. As mentioned above, in the rotation angle detection device according to the present invention, the relative position of the rotation angle information recording part and the sensor head is determined by the thermal expansion coefficient of the turntable, the thermal expansion coefficient of the rotating shaft, and the temperature characteristic coefficient of the sensor head, so that The optimal relative position of the rotation angle information recording section and the sensor head is maintained, even if the ambient temperature changes. Therefore, the output signal can be stabilized to reduce detection errors, and at the same time, the combination strength of the turntable and the shaft can be improved. In addition, it can expand the available temperature range and obtain high-resolution and high-precision rotation angle detection. The turntable of the rotation angle detection device of the present invention is made of synthetic resin material, and is provided with a fixing portion to be fixed to the rotation axis of the rotation angle detection device, and a cylindrical portion extending from the outer peripheral portion of the fixing portion along the rotation axis line. And a disc body portion extending from one end of the cylindrical portion in a direction perpendicular to the axis of the rotation axis. Therefore, when the ambient temperature rises, the cylindrical part mainly expands in the axial direction, and 俾 -14- (12) (12) 1221187 offsets the expansion of the shaft in the axial direction. In addition, 'a first mounting portion providing a minimum gap between the rotating shaft and the turntable is provided to improve its coaxiality and a second mounting portion for bonding or fixing the turntable to the rotating shaft is provided, which can maintain a sense of Stable positional relationship between the probe and the turntable, without fear of temperature changes, while maintaining a high degree of coaxiality. [Brief description of the drawings] FIG. 1 is a cross-sectional view of a first embodiment of a surrounding part. FIG. 2 is a diagram of a sensing head. FIG. 3 shows a situation where the light-condensing point and the element point overlap. FIG. 4 is a state effect diagram of temperature rise. Fig. 5 is a cross-sectional view of a second embodiment of the surrounding portion. FIG. 6 is a state effect diagram of temperature rise. Fig. 7 is a sectional view of a third embodiment of the surrounding portion. Fig. 8 is a sectional view of a fourth embodiment of the surrounding portion. Fig. 9 is a cross-sectional view of a fifth embodiment of the surrounding portion. Fig. 10 is a sectional view of a sixth embodiment of the surrounding part; Figure 11 is a partial cross-sectional view of a conventional transmissive encoder. Fig. 12 is an enlarged plan view of a conventional encoder. Fig. 13 is a partial sectional view of a conventional reflective encoder. Figure 14 is a partial cross-sectional view of a conventional transmissive encoder with integrated turntable [Description of the drawing number] -15- (13) 1221187 1 Motor 2 Rotary shaft • 3 Bearings * 4 Bearings 5 Assembly hub 5a Mounting holes 5b Support surface 6 Set screws 7 Rotary ruler 7a Rotation angle information recording unit 8 Positioning ring 9 Adhesive 10 Circuit board 11 Sensor head 12 Frame body 12a Upper frame body portion 12b Lower frame body portion 13 Light emitting element 14 Collimator lens 15 Fixed ruler 16 Light receiving element 17 Sensor head 18 Turntable 18a Rotation angle information recording section-16 (14) 1221187 18b Mounting hole 19 Adhesive 2 1 Motor 22 Rotary shaft 23 Upper bearing 24 Lower bearing 25 Turntable 25a Fixing portion 25b Cylinder portion 25c Disk body portion 25d Mounting hole / First mounting section 25e Second mounting section 26 Adhesive 27 Rotation angle information recording section 28 Reflective sensor head 29 Circuit board 3 1 Light emitting element 32 First collimator lens 33 Second collimator lens 34 Light receiving element 5 1 Motor 52 Rotating shaft 52a Groove 53 Turntable-17 (15) 1221187 53a Fixing portion 53b Cylindrical portion 53c Disk body portion 53d Mounting hole 54 Adhesive ^ 6 1 Motor 62 Rotating shaft 62a Screw hole 63 Turntable 63a Fixing portion 63b Cylinder portion 63c Disk body portion 63 d Mounting hole 63 e Recessed hole 64 Washer 65 Set screw A Reference mounting surface B Condensing point C Assembly point D Assembly point E Element point H Distance H? Distance L Distance-18 1221187 (16) L 'distance S distance